If you don't quite know which one of the many, many Debian-based distributions that are the one for you, this guide might help you.
Read the Drag's Guide to Debian variations.

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It's been my personal experiance that Debian is the most complete Linux distribution aviable and it's community tends to produce the highest quality packages for software. For any situation were I need to deploy a operating system were myself is responsable for support Debian would be my first choice.